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函数f(x)=2x/(x-1)的值域
人气:372 ℃ 时间:2020-04-05 02:07:37
解答
f(x)=2x/(x-1)
=(2x-2+2)/(x-1)
=(2x-2)/(x-1)+2/(x-1)
=2+2/(x-1)
∵ 2/(x-1)≠0
∴ f(x)的值域是(-∞,2)U(2,+∞)
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